Are you certified with NADCA or IAQCert — and can I verify it myself?
Certification proves a company follows industry training standards — but you should never take their word for it. A legitimate company will welcome you checking. This question has two parts, depending on what you find.
IAQCert certifies individual technicians — always ask for their Certificate ID and confirm it online, whether or not the company is a NADCA member.
Verify NADCA membership
Search the company's legal name on NADCA's official directory.
nadca.com/find-a-professional →Verify IAQCert credentials
Ask the technician for their Certificate ID, then enter it on IAQCert's verification page.
CADCT-089341iaqcert.com/verify-certificate →
If they're a verified NADCA member
NADCA requires members to carry liability insurance and prove it to the association. If you find them listed on NADCA's directory, that insurance requirement has already been verified — you're in good shape on coverage.
If they are not a NADCA member
Ask for proof of liability insurance before you book — especially if they'll be working inside your furnace or on your HVAC system. If something is damaged during the job, you need to know they're properly covered.
A legitimate company will provide a certificate of insurance without hesitation. Don't let an uninsured contractor touch your furnace.
You might wonder
"Does it really matter if they're not certified?"
Yes — it matters a lot. Saving a few dollars on an uncertified company is a gamble most homeowners wouldn't take if they understood what's actually at stake:
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Safety first
Duct cleaning puts technicians inside your furnace — near wiring, motors, gas lines, and heat exchangers. An untrained person can cause a short circuit, damage components, or create conditions that lead to overheating or fire. Certification means they were trained on electrical and HVAC safety, not just how to plug in a vacuum.
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Real skill for a genuinely difficult job
Ducts run between walls, floors, and ceilings — most of your system is completely hidden. Cleaning it properly requires knowing how airflow works, where to access the full run, and how to do it without damaging your home. Untrained crews routinely skip what they can't easily reach.
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You can't verify the result yourself
Nobody can show you a photo of the inside of a duct buried in your wall. You have to trust that the work was done — which means trusting the knowledge and skill of whoever you let in. Certification is one of the few objective ways to know that training was tested, not just claimed on a flyer.
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Training has to stay current
IAQCert and NADCA credentials aren't permanent stickers. Technicians must renew every year — and NADCA members must pass a recertification exam annually. That keeps standards current, not based on a course someone took a decade ago.
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The cost of getting it wrong
If an uncertified contractor damages your furnace, ductwork, or wiring, repair bills can run into thousands — with no guarantee they're insured or accountable. Saving $50 on the quote to hire an unverified company is a bet on your home's safety and your wallet. It's not a smart trade.
Certification isn't marketing fluff. It's proof that someone was trained, tested, insured, and held to a standard — in a trade where you literally cannot inspect most of what they touch.
Good answer
"Yes — search our company name on NADCA. As a member, we carry the liability insurance NADCA requires. Our technicians hold active IAQCert IDs and we'll share them before your appointment."
Red flag
They claim certification but can't tell you how to verify, refuse to provide an IAQCert ID, won't show proof of insurance when they're not on NADCA, or get defensive when you ask.